Movement of a molecule against a concentration gradient occurs in:
a. simple diffusion
b. facilitated diffusion
c. osmosis
d. active transport
e. passive transport
d
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Excessive sodium intake can lead to:
a. poor absorption of amino acids b. loss of vitamins in food sources c. high blood pressure d. excess calorie intake e. high cholesterol levels
During the reactions of photosynthesis, __________ is reduced and __________ is oxidized
a. O2; C6H12O6 b. CO2; C6H12O6 c. H2O; C6H12O6 d. O2; H2O e. CO2; H2O
In trisomy 21, while all genetic information is intact, a(n) abnormal copy of this chromosome creates a genetic
imbalance which causes abnormal physical and mental development. _________________ Indicate whether the statement is true or false.
The theory called clonal selection says
A. Exposure to an antigen activates those T- and B-cells with receptors recognizing specific epitopes on the antigen B. B cells provide resistance through direct cell-to-cell contact with, and lysis of, infected or otherwise abnormal cells C. T cells are involved in the process by which antibodies are produced against epitopes D. The activation of T cells produces antibodies that recognize epitopes